DE102006015222B4 - QFN package with optimized pad geometry - Google Patents
QFN package with optimized pad geometry Download PDFInfo
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- DE102006015222B4 DE102006015222B4 DE102006015222.0A DE102006015222A DE102006015222B4 DE 102006015222 B4 DE102006015222 B4 DE 102006015222B4 DE 102006015222 A DE102006015222 A DE 102006015222A DE 102006015222 B4 DE102006015222 B4 DE 102006015222B4
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- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
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Abstract
Gehäuseanordnung mit einem Gehäuse (11) zur Aufnahme einer Halbleiter- oder Sensoranordnung und mit einer Leiterplatte, wobei das Gehäuse (11) eine Mehrzahl von als Anschlussflächen eingesetzten Metallkörpern (2) enthält, wobei die Metallkörper (2) jeweils einen ersten Flächenbereich (7) und einen zweiten Flächenbereich (10) aufweisen, wobei die Metallkörper (2) jeweils über eine Bondverbindung mit wenigstens einer zu kontaktierenden Ebene (1, 1') der Halbleiter- oder Sensoranordnung elektrisch leitend verbunden sind und die Bondverbindungen die Metallkörper (2) jeweils in den zweiten Flächenbereichen (10) kontaktieren, wobei die Metallkörper (2) in den ersten Flächenbereichen (7) über jeweils eine Lötverbindung fest mit einem lotbenetzten Flächenteil jeweils einer Leiterbahn (5) der Leiterplatte verbunden sind und in den zweiten Flächenbereichen (10) jeweils nicht fest mit der Leiterplatte verbunden sind, wobei eine Erstreckung der Metallkörper (2) in einer Ebene parallel zu der Leiterplatte jeweils größer ist, als der lotbenetzte Flächenteil der jeweiligen Leiterbahn (5), dadurch gekennzeichnet, dass die ersten Flächenbereiche (7) aller Metallkörper jeweils näher an einer Mitte des Gehäuses (11) angeordnet sind als die zweiten Flächenbereiche (10), dass die als Anschlussflächen eingesetzten Metallkörper (2) an einer Unterseite des Gehäuses (11) als erhabene Flächen den Gehäuseboden überragen oder bündig mit diesem abschließen und dass jeder der Metallkörper (2) eine von einem Lot (8) der jeweiligen Lötverbindung benetzte Fläche aufweist, die größer ist als der lotbenetzte Flächenteil der Leiterbahn (5), mit der der jeweilige Metallkörper verbunden ist.Housing arrangement with a housing (11) for accommodating a semiconductor or sensor arrangement and with a printed circuit board, wherein the housing (11) contains a plurality of metal bodies (2) used as connecting surfaces, wherein the metal bodies (2) each have a first area region (7). and a second area region (10), the metal bodies (2) being electrically conductively connected in each case via a bonding connection to at least one plane (1, 1 ') of the semiconductor or sensor arrangement to be contacted, and the bonding connections in each case to the metal bodies (2) Contact the second surface areas (10), wherein the metal body (2) in the first surface areas (7) via a respective solder connection fixed to a solder wetted surface part of a conductor track (5) of the circuit board are connected and not in the second surface areas (10) are firmly connected to the circuit board, wherein an extension of the metal body (2) in a plane p is in each case larger than the solder-wetted surface part of the respective printed conductor (5), characterized in that the first surface regions (7) of all metal bodies are respectively arranged closer to a center of the housing (11) than the second surface regions (10) in that the metal bodies (2) used as connecting surfaces protrude over the housing bottom at a lower side of the housing (11) or flush with the housing bottom and that each of the metal bodies (2) has a surface wetted by a solder (8) of the respective soldered connection , which is larger than the solder wetted surface portion of the conductor track (5) to which the respective metal body is connected.
Description
Stand der TechnikState of the art
Sensoren und Halbleiter werden in zunehmendem Maße in sogenannte „leadless” Gehäuse bzw. QFN-Gehäuse eingebettet. Diese haben im Gegensatz zu „klassischen” Gehäusen von Schaltkreisen oder Sensoren, wie PLCC oder SOIC, keine aus dem Gehäuse herausreichenden Beinchen, sondern werden stumpf auf Leiterplatten aufgelötet.Sensors and semiconductors are increasingly being embedded in so-called "leadless" packages or QFN packages. In contrast to "classic" housings of circuits or sensors, such as PLCC or SOIC, these do not have any legs extending out of the housing, but are butt-soldered to printed circuit boards.
Zu diesem Zwecke sind in den Gehäusebereich neben den im Gehäuse eingeschlossenen Chip- oder Sensorkomponenten Anschlussflächen integriert. Die Anschlussflächen werden zumeist durch kleine Metallkörper gebildet, die an der Gehäuseunterseite als erhabene lötverbindbare Fläche den Gehäuseboden überragen oder bündig mit diesem abschließen und im Inneren des Gehäuses bis in eine Ebene, in der sich die Chipstruktur befindet, führen. Die elektrische Verbindung zwischen den Anschlussflächen und den zu kontaktierenden Chipbestandteilen erfolgt gemäß dem Stand der Technik über Bondverbindungen, bevor das Gehäuse vervollständigt und die enthaltene Chipstruktur in der Regel vollständig versiegelt wird.For this purpose, pads are integrated in the housing area in addition to the chip or sensor components enclosed in the housing. The pads are usually formed by small metal body, which project beyond the bottom of the housing as a raised solderable surface, the housing bottom or flush with this and inside the housing into a plane in which the chip structure is lead. The electrical connection between the pads and the chip components to be contacted is made according to the prior art via bonds before the housing is completed and the contained chip structure is usually completely sealed.
Die Dimensionierung der Anschlussflächen erfolgt gemäß dem Stand der Technik so, dass ein fehlerfreies Drahtbonden ermöglicht wird und gleichzeitig eine ausreichend feste Lötverbindung mit zu vernachlässigendem elektrischen Widerstand ohne großen Aufwand realisiert werden kann. Diesen Anforderungen ist mit relativ kleinen Anschlussflächen zu genügen, weshalb sich ein sehr kompaktes Design für die Ausbildung der Kontaktflächen durchgesetzt hat, das sich in den meisten der heute verwendeten QFN-Gehäusen finden lässt.The dimensioning of the pads is carried out according to the prior art so that a fault-free wire bonding is made possible and at the same time a sufficiently strong solder joint with negligible electrical resistance can be realized without much effort. These requirements are met with relatively small pads, which is why a very compact design for the formation of the contact surfaces has become established, which can be found in most of the QFN housings used today.
Die Position der Kontaktflächen richtet sich unter anderem nach technologisch bedingten Designregeln beim Drahtbonden, die als wesentliche Randbedingung einen minimalen Bondwinkel zu berücksichtigen haben, der bei Hinführung des Bonddrahtes zur auch Bondland genannten Kontaktfläche zwischen dem Bonddraht und der Flächennormale nicht unterschritten werden darf. Generell wird ein flaches Herausführen des Bonddrahtes aus der Chipstruktur als vorteilhaft angesehen, wobei der angesprochene Bondwinkel keinesfalls kleiner als 45° werden sollte.The position of the contact surfaces depends, inter alia, on technologically-conditioned design rules for wire bonding, which have to take into account a minimum boundary angle as the essential boundary condition, which must not be undershot when the bonding wire is led to the contact area between the bonding wire and the surface normal also referred to as Bondland. In general, a flat lead out of the bonding wire from the chip structure is considered advantageous, the addressed bond angle should never be less than 45 °.
Große Bondwinkel lassen sich stets realisieren, wenn die Kontaktfläche in ausreichend großem Abstand von der zu kontaktierenden Chipstruktur angeordnet ist. Da sich die zur vollständigen Kontaktierung einer komplexen Chipstruktur erforderlichen zahlreichen Kontaktflächen in der Regel in einem die Chipstruktur vollständig umgebenden Randbereich des Gehäuses befinden, werden unter Berücksichtigung der angesprochenen Designregeln, insbesondere der Bedeutung des minimalen Bondwinkels, in herkömmlichen QFN-Gehäusen teilweise Abstände zwischen sich diagonal gegenüber liegenden Kontaktflächen und den dadurch bestimmten Lötstellen auf der Leiterplatte vorgesehen, welche die Erstreckung der eigentlichen Chipstruktur bei weitem übertreffen. Das gilt in besonders starkem Maße bei der Verwendung von relativ dicken Chips oder Chipstapeln, bei denen in mehreren Ebenen übereinander angeordnete Bereiche zu kontaktieren sind, was zu großen Gehäuseabmessungen führt.Large bond angles can always be realized if the contact surface is arranged at a sufficiently large distance from the chip structure to be contacted. Since the numerous contact surfaces required for the complete contacting of a complex chip structure are generally located in an edge region of the housing that completely surrounds the chip structure, partial distances between them become diagonal between them, taking into account the design rules mentioned, in particular the significance of the minimum bonding angle in conventional QFN packages provided opposite contact surfaces and the soldering holes determined thereby on the circuit board, which far exceed the extension of the actual chip structure. This is particularly true in the use of relatively thick chips or chip stacks in which to be contacted in several levels superimposed areas, resulting in large housing dimensions.
Das verwendete Leiterplattenmaterial und gebräuchliche Chipgehäuse zeichnen sich in aller Regel durch unterschiedliche thermische Ausdehnungskoeffizienten aus. Da viele elektronische Schaltungen, insbesondere bei einem Einsatz in Kraftfahrzeugen, teilweise in großen Temperaturbereichen ihre Funktionsfähigkeit behalten müssen, kommt der Berücksichtigung thermischer Spannungen besondere Bedeutung zu.The printed circuit board material used and common chip packages are usually characterized by different thermal expansion coefficients. Since many electronic circuits, in particular for use in motor vehicles, sometimes have to retain their functionality in large temperature ranges, the consideration of thermal stresses is of particular importance.
Insbesondere Sensoren reagieren empfindlich auf Durchbiegungen, die sich aus einer unterschiedlichen thermischen Ausdehnung von Leiterplatte und Chipgehäuse ergeben können. Das Problem einer störenden Durchbiegung steigt mit größeren geometrischen Abmessungen stark an. Aus Sicht einer geringen Temperaturempfindlichkeit wäre ein möglichst geringer Abstand zwischen den einzelnen Lötflächen anzustreben. Dieser Forderung stehen jedoch, wie bereits beschrieben, bei der etablierten Technologie die sich aus der Bondverbindung ergebenden Randbedingungen entgegen.In particular, sensors are sensitive to deflections, which may result from a different thermal expansion of the printed circuit board and chip package. The problem of disturbing deflection increases sharply with larger geometric dimensions. From the point of view of a low temperature sensitivity, the smallest possible distance between the individual soldering surfaces would be desirable. However, as already described, this requirement is opposed in the case of the established technology by the boundary conditions resulting from the bond connection.
Die Druckschriften
Offenbarung der ErfindungDisclosure of the invention
Technische AufgabeTechnical task
Die Erfindung hat die Aufgabe, eine Möglichkeit anzugeben, die durch Temperaturänderungen bedingte Biegebeanspruchung von Halbleiter- oder Sensoranordnungen in stumpf aufgelöteten Gehäusen zu reduzieren.The invention has the object to provide a way to reduce the temperature changes caused by bending stress of semiconductor or sensor assemblies in blunted casings.
Technische LösungTechnical solution
Die Aufgabe wird gelöst durch eine Halbleiter- oder Sensoranordnung in einem stumpf auf eine Leiterplatte aufgelöteten Gehäuse mit den Merkmalen von Anspruch 1. Die Ansprüche 2 bis 8 geben vorteilhafte Ausgestaltungen der Erfindung an.The object is achieved by a semiconductor or sensor arrangement in a dull on a printed circuit board soldered housing having the features of
Die Erfindung geht davon aus, dass es vermieden werden sollte, die Bondverbindungen in einem Bereich der Anschlussflächen zu realisieren, der unmittelbar über der festen Lötverbindung zwischen den als Anschlussflächen eingesetzten Metallkörpern und den jeweils zugehörigen Leiterbahnen liegt. The invention assumes that it should be avoided to realize the bonding connections in a region of the connection surfaces which lies directly above the fixed solder connection between the metal bodies used as connection surfaces and the respectively associated conductor tracks.
Nur die relative Lage dieser Bereiche zueinander bestimmt jedoch die mechanischen Eigenschaften des Verbundes aus Chipgehäuse und Leiterplatte, also Stresswirkungen durch unterschiedliche thermische Ausdehnungskoeffizienten. Gemäß der Erfindung ist ein Flächenbereich einer Anschlussfläche fest mit einer Leiterbahn verlötet und ein anderer Flächenbereich der Anschlussfläche ohne feste Verbindung zur Leiterplatte, insbesondere zur Leiterbahn. Der Flächenbereich, der fest mit einer Leiterbahn verlötet ist, befindet sich in einer chipnahen Position, während der Flächenbereich ohne feste Verbindung zur Leiterplatte zumindest in eine chipfernere Randzone des Gehäuses reicht. Unter fester Verbindung im Sinne der Erfindung, wird dabei eine Verbindung verstanden, bei der die Zone der kürzesten Verbindung zwischen zwei sich gegenüberliegenden Flächenbereichen durch ein an beiden Flächenbereichen fest anhaftendes Verbindungsmittel, insbesondere ein verwendetes Lot, erfüllt wird.However, only the relative position of these areas to each other determines the mechanical properties of the composite of the chip housing and printed circuit board, ie stress effects by different thermal expansion coefficients. According to the invention, a surface region of a connection surface is firmly soldered to a conductor track and another surface region of the connection surface without a fixed connection to the printed circuit board, in particular to the conductor track. The area which is soldered firmly to a conductor track is in a position close to the chip, while the area area without fixed connection to the circuit board extends at least into a region of the housing which is farther away from the chip. A solid connection in the sense of the invention, a connection is understood in which the zone of the shortest connection between two opposing surface areas by a firmly adhering to both surface areas connecting means, in particular a Lot used, is met.
Die Erfindung umfasst eine Halbleiter- oder Sensoranordnung in einem stumpf auf eine Leiterplatte aufgelöteten Gehäuse, an dem zumindest einige der Anschlussflächen nicht vollflächig verlötet sind, wobei die nicht vollflächig verlöteten Anschlussflächen in einem ersten Flächenbereich fest mit einem Leiterbahnabschnitt verlötet sind und in einem zweiten Flächenbereich nicht fest mit der Leiterplatte verbunden sind, wobei die fest verlöteten Flächenbereiche näher an der zu kontaktierenden Halbleiter- oder Sensorstruktur liegen als die nicht fest mit der Leiterplatte verbundenen Flächenbereiche. Dadurch ergeben sich relativ weit von der eigentlichen Chipanordnung entfernte Flächenbereiche auf den Anschlussflächen, die für die Befestigung des Bonddrahtes genutzt werden können, ohne zum thermischen Lötstress beizutragen.The invention comprises a semiconductor or sensor arrangement in a blunt on a printed circuit board soldered housing on which at least some of the pads are not soldered over the entire surface, wherein the not fully soldered pads are soldered in a first area fixed to a conductor track portion and not in a second area are firmly connected to the circuit board, wherein the soldered surface areas are closer to the semiconductor or sensor structure to be contacted than the surface areas not firmly connected to the circuit board. This results in relatively far away from the actual chip assembly surface areas on the pads, which can be used for the attachment of the bonding wire, without contributing to the thermal Lötstress.
Vorteilhafte WirkungenAdvantageous effects
Wenn nicht alle Anschlussflächen die erfindungsgemäße Lötanbindung aufweisen, ist es zweckmäßig, die größten Abstände zwischen verlöteten Flächenbereichen dadurch zu reduzieren, dass zumindest einige Anschlussflächen, die große Abstände zu anderen Anschlussflächen aufweisen, durch die erfindungsgemäße Verlötung auf der Leiterplatte fixiert werden. Auf diese Weise lassen sich zumindest die maximalen stressrelevanten Längen reduzieren. Beispielsweise sollten diagonal im Gehäuse gegenüberliegende Anschlussflächen nicht beide vollflächig verlötet sein.If not all connection surfaces have the solder connection according to the invention, it is expedient to reduce the greatest distances between soldered surface regions in that at least some connection surfaces, which have large distances to other connection surfaces, are fixed on the circuit board by the soldering according to the invention. In this way, at least the maximum stress-relevant lengths can be reduced. For example, diagonally opposite connection surfaces in the housing should not both be soldered over the whole area.
Die Festlegung der Flächen, die im Falle der Verlötung fest miteinander verbunden werden, wird in der Regel durch eine Begrenzung dieser Flächen durch entsprechende Lackabdeckungen vorgenommen. Es ist weit verbreitet, auf Leiterplatten bzw. Leiterbahnen sogenannte Lötlands vorzubereiten, indem die benachbarten Bereiche durch Lackabdeckungen vor einer Benetzung durch das verwendete Lot geschützt werden. Bei Verwendung derart vorbereiteter Leiterplatten wird die Erfindung auf vorteilhafte Weise verkörpert durch eine Halbleiter- oder Sensoranordnung in einem stumpf auf eine Leiterplatte aufgelöteten Gehäuse, enthaltend als Anschlussflächen eingesetzte Metallkörper, welche an der Gehäuseunterseite zumindest teilweise lotbenetzte Flächen aufweisen und die im Inneren des Gehäuses durch Bondverbindungen mit der Halbleiter- oder Sensoranordnung in leitender Verbindung stehen, wobei die Erstreckung zumindest einiger der Metallkörper in einer Ebene parallel zur Leiterplatte größer ist, als der Flächenteil der zur jeweiligen Anschlussfläche führenden Leiterbahn, der sich mit dem Lot in direktem Kontakt befindet, und die Bondverbindung auf diesen Metallkörpern in einem Flächenbereich realisiert ist, der nicht unmittelbar über der festen Lötverbindung zwischen den als Anschlussflächen eingesetzten Metallkörpern und den jeweils zugehörigen Leiterbahnen liegt. Die Bereiche der festen Lötverbindungen liegen näher an der Gehäusemitte als die Flächenbereiche, in denen die Bondverbindung realisiert ist. Die Anschlussflächen weisen also Bereiche auf, welche deutlich über die Bereiche der festen Lötverbindung hinausragen. Auf diese Weise wird Platz gewonnen, um die Bondverbindungen in ausreichendem Abstand von der Chipstruktur zu realisieren, ohne die Gefahr einer zu starken Deformation bei Temperaturwechseln zu erhöhen.The definition of the surfaces that are firmly connected in the case of soldering, is usually made by limiting these areas by appropriate paint covers. It is widely used to prepare so-called Lötlands on circuit boards or printed circuit boards by the adjacent areas are protected by paint covers from wetting by the solder used. When using such prepared circuit boards, the invention is embodied in an advantageous manner by a semiconductor or sensor assembly in a dull on a circuit board soldered housing containing metal surfaces used as pads, which have at least partially solder wetted surfaces on the housing bottom and inside the housing by bonding are in conductive connection with the semiconductor or sensor arrangement, wherein the extension of at least some of the metal body in a plane parallel to the printed circuit board is greater than the surface portion of the leading to the respective pad conductor, which is in direct contact with the solder, and the bond is realized on these metal bodies in a surface area which is not directly above the fixed solder joint between the metal bodies used as connection surfaces and the respectively associated conductor tracks. The areas of the fixed solder joints are closer to the center of the housing than the surface areas in which the bond connection is realized. The pads thus have areas that protrude significantly beyond the areas of the fixed solder joint. In this way, space is gained in order to realize the bond connections at a sufficient distance from the chip structure, without increasing the risk of excessive deformation during temperature changes.
Je nach eingesetzter Löttechnologie können die Anschlussflächen so vorbereitet werden, dass die als Anschlussflächen eingesetzten Metallkörper an der Gehäuseunterseite als erhabene Flächen den Gehäuseboden überragen oder bündig mit diesem abschließen. Besonders vorteilhaft ist es, wenn alle Anschlussflächen einheitlich befestigt werden können, also die Erstreckung aller als Kontaktflächen eingesetzten Metallkörper in einer Ebene parallel zur Leiterplatte größer ist, als der Flächenteil der zur jeweiligen Anschlussfläche führenden Leiterbahn, der sich mit dem Lot in direktem Kontakt befindet, und von allen Anschlussflächen nur der chipnahe Flächenteil fest mit der Leiterbahn verlötet ist, während chipferner angeordnete Bereiche für die jeweilige Bondverbindung genutzt werden. Auf diese Weise lässt sich bei symmetrischer Anordnung der Anschlussflächen um die Chipstruktur herum eine gegenüber herkömmlichen QFN-Gehäusen besonders gleichmäßige Reduzierung der Spannungs- und Biegebelastung erzielen.Depending on the soldering technology used, the connection surfaces can be prepared in such a way that the metal bodies used as connection surfaces on the underside of the housing project beyond the housing bottom as flush surfaces or terminate flush therewith. It is particularly advantageous if all connection surfaces can be fixed uniformly, ie the extension of all metal bodies used as contact surfaces in a plane parallel to the printed circuit board is greater than the surface part of the conductor path leading to the respective connection surface, which is in direct contact with the solder, and of all pads only the chip near surface part is firmly soldered to the conductor, while chip remote arranged areas are used for the respective bond. In this way, with a symmetrical arrangement of the connection surfaces around the chip structure, it is possible to achieve a particularly uniform reduction of the stress and bending load compared to conventional QFN housings.
Die Form der Anschlussflächen sollte so gehalten sein, dass eine eng benachbarte Anordnung ermöglicht wird, um eine Vielzahl erfindungsgemäß kontaktierter Chipbereiche ansprechen zu können. Es ist daher vorteilhaft, wenn die als Anschlussflächen eingesetzten Metallkörper eine Haupterstreckungsrichtung aufweisen, die vom Rand des Gehäuses in den zentralen Bereich des Gehäuses verläuft und in der Ebene parallel zur Leiterplatte ein Verhältnis von Länge zu Breite aufweisen, das größer als 2:1 ist. Besser noch ist ein Seitenverhältnis von größer als 3:1, da die erfindungsgemäße geometrische Entkopplung des Befestigungsortes der Anschlussfläche an der Leiterplatte von der Position der Bondverbindung auf der Anschlussfläche bei weiterhin dichter Anordnung der Anschlussflächen so noch besser zum Tragen kommen kann. The shape of the connection surfaces should be kept such that a closely adjacent arrangement is made possible in order to be able to address a multiplicity of chip areas contacted according to the invention. It is therefore advantageous if the metal bodies used as connecting surfaces have a main extension direction which extends from the edge of the housing into the central region of the housing and in the plane parallel to the printed circuit board have a length to width ratio which is greater than 2: 1. Better still is an aspect ratio of greater than 3: 1, since the inventive geometric decoupling of the mounting location of the pad on the circuit board from the position of the bond on the pad in still dense arrangement of the pads so even better come to fruition.
Durch die Möglichkeit, die Bondplätze weit nach außen in einen ausreichenden Abstand von der Chipstruktur zu verlegen, ohne den Stresseintrag in den Verbund aus Gehäuse und Leiterplatte zu erhöhen, ist es unkritisch, wenn die als Anschlussflächen eingesetzten Metallkörper im Gehäuseinneren eine Bondfläche aufweisen, die in der Ebene liegt, auf welcher die Chipstruktur der Halbleiter- oder Sensoranordnung aufsitzt, also beim Bonden ein relativ großer Höhenunterschied überwunden werden muss. Das stellt vor dem Hintergrund der Nutzbarkeit einer etablierten Bondtechnologie einen erheblich Vorteil dar und gilt sogar, wenn eine Chipstruktur enthalten ist, die mehrere übereinanderliegende Ebenen umfasst, die durch Bonddrähte mit Anschlussflächen in Verbindung stehen.Due to the possibility of laying the bonding sites far enough away from the chip structure at a sufficient distance without increasing the stress in the composite of housing and printed circuit board, it is not critical if the metal bodies used as connection surfaces have a bonding surface inside the housing the level is on which the chip structure of the semiconductor or sensor assembly is seated, so when bonding a relatively large difference in height must be overcome. This is a significant advantage against the background of the usability of an established bonding technology, and even applies when a chip structure is included that includes multiple superposed planes connected by bonding wires to pads.
Ein besonders wirkungsvolle geometrische Entkopplung des Befestigungsortes der Anschlussfläche an der Leiterplatte von der Position der Bondverbindung lässt sich realisieren, wenn die als Kontaktflächen eingesetzten Metallkörper so angeordnet sind, dass der Flächenteil der zur jeweiligen Anschlussfläche führenden Leiterbahn, der sich mit dem Lot in direktem Kontakt befindet, zumindest teilweise unter die Chipstruktur führt, während die Bondverbindung zur Anschlussfläche ausreichend weit neben der Chipstruktur angeordnet wird. Auf diese Weise lassen sich stressrelevante Längen innerhalb der Gesamtanordnung auf die Erstreckung der eigentlichen Chipstruktur reduzieren, obwohl die Kontaktierung der obersten zu kontaktierenden Chipebene mit einem Bondwinkel erfolgen kann, der stets größer als 45°, besser noch größer als 60°, ist.A particularly effective geometric decoupling of the attachment location of the connection surface on the circuit board from the position of the bonding connection can be realized if the metal bodies used as contact surfaces are arranged such that the surface part of the conductor path leading to the respective connection surface, which is in direct contact with the solder , At least partially leads under the chip structure, while the bonding connection is arranged to the pad sufficiently far from the chip structure. In this way, stress-relevant lengths can be reduced within the overall arrangement to the extension of the actual chip structure, although the contacting of the top chip to be contacted chip level can be done with a bond angle which is always greater than 45 °, better still greater than 60 °.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
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Ausführungsform der ErfindungEmbodiment of the invention
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Priority Applications (4)
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DE102006015222.0A DE102006015222B4 (en) | 2006-03-30 | 2006-03-30 | QFN package with optimized pad geometry |
FR0754080A FR2899383B1 (en) | 2006-03-30 | 2007-03-28 | QFN HOUSING WITH OPTIMIZED CONNECTION SURFACE GEOMETRY. |
JP2007085332A JP2007273986A (en) | 2006-03-30 | 2007-03-28 | Semiconductor device or sensor device |
US11/731,054 US7825524B2 (en) | 2006-03-30 | 2007-03-30 | QFN housing having optimized connecting surface geometry |
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DE102006015222.0A DE102006015222B4 (en) | 2006-03-30 | 2006-03-30 | QFN package with optimized pad geometry |
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DE102006015222B4 true DE102006015222B4 (en) | 2018-01-04 |
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JP (1) | JP2007273986A (en) |
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US5866939A (en) * | 1996-01-21 | 1999-02-02 | Anam Semiconductor Inc. | Lead end grid array semiconductor package |
US6927479B2 (en) * | 2003-06-25 | 2005-08-09 | St Assembly Test Services Ltd | Method of manufacturing a semiconductor package for a die larger than a die pad |
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US5990545A (en) * | 1996-12-02 | 1999-11-23 | 3M Innovative Properties Company | Chip scale ball grid array for integrated circuit package |
JPH1154658A (en) * | 1997-07-30 | 1999-02-26 | Hitachi Ltd | Semiconductor device, manufacture thereof and frame structure |
JP2001230360A (en) * | 2000-02-18 | 2001-08-24 | Hitachi Ltd | Semiconductor integrated circuit device and method of manufacturing the same |
KR100559664B1 (en) * | 2000-03-25 | 2006-03-10 | 앰코 테크놀로지 코리아 주식회사 | Semiconductor package |
CN100380651C (en) * | 2002-04-30 | 2008-04-09 | 株式会社瑞萨科技 | Semiconductor device and electronic device |
JP2003338519A (en) * | 2002-05-21 | 2003-11-28 | Renesas Technology Corp | Semiconductor device and its manufacturing method |
US7405468B2 (en) * | 2003-04-11 | 2008-07-29 | Dai Nippon Printing Co., Ltd. | Plastic package and method of fabricating the same |
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US5866939A (en) * | 1996-01-21 | 1999-02-02 | Anam Semiconductor Inc. | Lead end grid array semiconductor package |
US6927479B2 (en) * | 2003-06-25 | 2005-08-09 | St Assembly Test Services Ltd | Method of manufacturing a semiconductor package for a die larger than a die pad |
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JP2007273986A (en) | 2007-10-18 |
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US7825524B2 (en) | 2010-11-02 |
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